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The reason we have a separate public license for some libraries is that they blur the
distinction we usually make between modifying or adding to a program and simply using it.
Linking a program with a library, without changing the library, is in some sense simply
using the library, and is analogous to running a utility program or application program.
However, in a textual and legal sense, the linked executable is a combined work, a
derivative of the original library, and the ordinary General Public License treats it as
such.
Because of this blurred distinction, using the ordinary General Public License for
libraries did not effectively promote software sharing, because most developers did not
use the libraries. We concluded that weaker conditions might promote sharing better.
However, unrestricted linking of non-free programs would deprive the users of those
programs of all benefit from the free status of the libraries themselves. This Library
General Public License is intended to permit developers of non-free programs to use free
libraries, while preserving your freedom as a user of such programs to change the free
libraries that are incorporated in them. (We have not seen how to achieve this as regards
changes in header files, but we have achieved it as regards changes in the actual
functions of the Library.) The hope is that this will lead to faster development of free
libraries.
The precise terms and conditions for copying, distribution and modification follow. Pay
close attention to the difference between a "work based on the library" and a "work that
uses the library". The former contains code derived from the library, while the latter
only works together with the library.
Note that it is possible for a library to be covered by the ordinary General Public
License rather than by this special one.
TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
0. This License Agreement applies to any software library which contains a notice placed
by the copy-right holder or other authorized party saying it may be distributed under the
terms of this Library General Public License (also called "this License"). Each licensee
is addressed as "you".
A "library" means a collection of software functions and/or data prepared so as to be
conveniently linked with application programs (which use some of those functions and
data) to form executables.
The "Library", below, refers to any such software library or work which has been
distributed under these terms. A "work based on the Library" means either the Library or
any derivative work under copyright law: that is to say, a work containing the Library or
a
portion
of
it,
straightforwardly into another language. (Hereinafter, translation is included without
limitation in the term "modification".)
"Source code" for a work means the preferred form of the work for making modifications to
it. For a library, complete source code means all the source code for all modules it
contains, plus any associated interface definition files, plus the scripts used to
control compilation and installation of the library.
Activities other than copying, distribution and modification are not covered by this
License; they are outside its scope. The act of running a program using the Library is
not restricted, and output from such a program is covered only if its contents constitute
a work based on the Library (independent of the use of the Library in a tool for writing
it). Whether that is true depends on what the Library does and what the program that uses
the Library does.
1. You may copy and distribute verbatim copies of the Library's complete source code as
you receive it, in any medium, provided that you conspicuously and appropriately publish
on each copy an appropriate copyright notice and disclaimer of warranty; keep intact all
the notices that refer to this License and to the absence of any warranty; and distribute
a copy of this License along with the Library.
You may charge a fee for the physical act of transferring a copy, and you may at your
option offer warranty protection in exchange for a fee.
2. You may modify your copy or copies of the Library or any portion of it, thus forming a
work based on the Library, and copy and distribute such modifications or work under the
terms of Section 1 above, pro-vided that you also meet all of these conditions:
a) The modified work must itself be a software library.
b) You must cause the files modified to carry prominent notices stating that you
changed the files and the date of any change.
c) You must cause the whole of the work to be licensed at no charge to all third
parties under the terms of this License.
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